That can be so frustrating, I have to go through it when ever I get a new PC. I delete ALL users except me and make me the Admin and on permissions I delete SYSTEM and make me the sole permissor, I recently found this great command line that lets you be God on your PC and oddly enough it's called God Mode, You might try it, Not gonna screw nothing up,It just fully opens the Pc and all it's stuff for you to edit so be careful what you change using it.

Create a new folder wherever you want the GodMode folder to be (I just used Desktop). Right-click in Windows Explorer, select New, then click Folder. Next, rename the folder. You can name the folder anything you like as long as you add a period followed by this exact text string: